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2. 5(x-5)+2(x-4) = 5x-25 + 2x-8 = 7x-17
3. 2x(x2+ 3 x + 5 ) = 2x´3 + 6x´2 + 10x
4. (x-5)( x´2 + 3x -4) = (x´3-5x´2) + (3x´2-15x) - (4x+20)
= x´3-2x´2-19x+20